Concordia: Mare Nostrum

A Concordia expansion map where you colonize Roman cities only from the sea. It does completely away with routes between cities. While the ships share sea regions from where they can build new houses in harbor cities of the Roman Empire, the land units offer additional new strategic choices inside a separate area on the board. It is a double sided board, designed for either 2 to 4 or for 3 to 5 players. You win by appeasing the Roman Gods in the usual manner of Concordia.

—description from the publisher